Journal
IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS
Volume -, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TNNLS.2022.3201518
Keywords
Encoding; Feature extraction; Joints; Graph neural networks; Convolution; Bones; Trajectory; Feature extraction; graph neural network; skeleton-based action recognition
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea Government (MSIT) [2020R1F1A1061667]
- National Research Foundation of Korea [2020R1F1A1061667] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Skeleton sequences are effective for action recognition on edge devices due to their lightweight and compact nature. By incorporating third-order features in the form of angular encoding into modern architectures, recognition performance can be improved while reducing parameters and run time. This fusion approach has achieved new state-of-the-art accuracy in large benchmarks such as NTU60 and NTU120.
Skeleton sequences are lightweight and compact, thus are ideal candidates for action recognition on edge devices. Recent skeleton-based action recognition methods extract features from 3D joint coordinates as spatial-temporal cues, using these representations in a graph neural network for feature fusion to boost recognition performance. The use of first- and second-order features, \ie{} joint and bone representations, has led to high accuracy. Nonetheless, many models are still confused by actions that have similar motion trajectories. To address these issues, we propose fusing third-order features in the form of angular encoding into modern architectures to robustly capture the relationships between joints and body parts. This simple fusion with popular spatial-temporal graph neural networks achieves new state-of-the-art accuracy in two large benchmarks, including NTU60 and NTU120, while employing fewer parameters and reduced run time. Our source code is publicly available at: https://github.com/ZhenyueQin/Angular-Skeleton-Encoding.
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